Trivia: What is NOT needed in hydroponic farming?
Oxygen
Water
Minerals
Soil
The correct answer is Soil
So why is this answer correct? : One hundred years ago, farmers would scoff at the idea of growing crops without soil. Today, this reality is made possible with high-tech equipment and nutrient-rich water. Hydroponic crops are grown in controlled greenhouses with pH-balanced water and a steady stream of magnesium, phosphorus, calcium, and other essential nutrients.